EFFECT OF DEEP OF SOWING AND LIGHT-INTENS ITY ON GERMINATION OF BARU SEEDS (DIPTERYX-ALATA VOG)

Effects of five deeps of sowing and two light intensities on germinati on of ''baru'' seeds have been studied. Seeding was done in plastic po ts of 22.5 cm of diameter by 18.5 cm of height, filled with washed san d, at 0, 1, 2, 3 e 4 cm of deep and light intensities were 100% of nat ural light, in an open field nursery, and 50% of natural light, in all woven nylon covered lath house. Light conditions, deeps of sowing, an d their interaction affected seed germination rate and speed of germin ation. Germination rates averaged 72.8% and 52.5%, and speed of germin ation were 17.1% and 11.1% seeds germinated per week, at 100% of light and 50% of light, respectively. Deeps of 1, 2 and 3 cm have been foun d to be the best ones with germination rates of 79.4%, 81.9%, and 78.8 % and speeds of germination of 18.4%, 19.2%, and 17.5% of seeds gemina ted per week, respectively. Interaction have been found to be signific ant at 0 cm of deep, where both germination rate and speed of germinat ion, only at this deep, where better at the 50% of light. In conclusio n, baru seeds should be planted from 1 to 3 cm of deep at 100% of ligh t intensity, to get the best results on final germination and speed of germination.